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Currently for oldwikisource one needs to use the syntax ... -lang:- ... which is not obvious. With there having been a change to WMF configuration of oldwikisource to mul.wikisource it would seem reasonable to have an alias (or similar) to be able to use the syntax ... -lang:mul ...

Pywikibot is a Python-based framework to write bots for MediaWiki. See https://www.mediawiki.org/wiki/Manual:Pywikibot for more information, and https://www.mediawiki.org/wiki/Manual:Pywikibot/PAWS for a short online interactive tutorial. Patches can be submitted via Gerrit (you need a MediaWiki.org account). More documentation on Gerrit can be found at https://www.mediawiki.org/wiki/Manual:Pywikibot/Gerrit. After you have successfully claimed this task on this site please do use the task in Phabricator for communication instead of this site. This allows more PWB developers to be reached! General development questions can be asked on the Pywikibot mailing list at https://lists.wikimedia.org/mailman/listinfo/pywikipedia-l and the #pywikibot IRC channel (see https://www.mediawiki.org/wiki/MediaWiki_on_IRC).